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*#2* Mack, J., Harbaugh, I. A., & McCarthy, J. The Greatest Equation Ever.
*#3* NEW, W. S. Encyclopedia> Trigonometric function-identities.
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*#6* Adams, A., Guercio Bernicia, Russell, Vincent, Smith, Chelsea, Smith Tariq. Trigonometric Identities. Identities In Use.
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